It's bad practice according to the ASDF maintainers due to reloading
issues. It's better to just assume that they are available.

Dependency on `uiop' can't be implicit for sake of `program-op' and
`image-op' builds. User may wish to not include `asdf' or `cmp' (in case
of ECL) in the final image. Also not including this dependency breaks
the build-system and the application separation and is clearly invalid
from the system definition point of view.

ASDF has option (require-system :system) which doesn't reload it, if
it's already present in the image (even if it's newer):

https://common-lisp.net/project/asdf/asdf.html#index-require_002dsystem

so if we create alternative patch like:

-  :depends-on (:alexandria :trivial-features :babel)
+  :depends-on ((:require :uiop) :alexandria :trivial-features :babel)

then ASDF shouldn't reload the system if it's present in the memory.

That said, ASDF doesn't handle (:require :system-name) options
correctly yet.

(see asdf/asdf!13).

Closes #96.

As recommended by Faré in issue #96.

Move the C toolchain support to its own system cffi-toolchain.

Create linkable object files and include them in output-files for
compile-op, so that they can be found and linked by a recent-enough
ASDF (3.1.6 or later).

Allow for delivery of a system with a single static and/or dynamic
library, and on support platform (CLISP, CMUCL, SBCL), enable delivery
of a standalone executable that statically links required extensions.

This requires a recent SBCL (will hopefully be released in 1.2.17).
ASDF 3.1.6 is required, but backward compatibility code is
provided at least back to ASDF 3.1.2.

On BSD, use ld -r for "libraries" instead of ar and possibly libtool.

When forking a Lisp to dump an image, support Quicklisp.

Make CFFI-Grovel generally more robust.

Document static linking operations in manual. Improve documentation.

Add test for ASDF support including wrappers.

Fixes launchpad bug #1414277.

Evaluated expressions in *FOREIGN-LIBRARY-DIRECTORIES* (and
*DARWIN-FRAMEWORK-DIRECTORIES*) can now return a list of pathnames.

Patch courtesy of James Anderson.

Generic function translate-into-foreign-memory and funtion
convert-into-foreign-memory definitions now loaded by cffi.  System
cffi-fsbv defined for calling functions with foreign structures by
value using libffi.  Current state of this system is to make
libffi-type-pointer and associate with the structure in defcstruct.
This works on test structure
(macroexpand '(defcstruct (complex :class complex-type) (real :double) (imag :double)))
but nothing further is done with the libffi-type-pointer.

To do: fix lookup-type so that if there is no type defined, it returns
nil.  Do iterate-foreign-structure in advance of macro expansion in
cstruct-libffi-hook, if any arguments lack type translation, then
return nil.  This means that that structure can not be passed/returned
by value.  Then load cif after cstruct.  Secondary bug fix: defsynonym
'unsigned to something, not sure what it's supposed to be; :uint?

- Added .gitignore.
- Adapted release.sh script to git.
- Removed :version from cffi.asd. Release tarballs now get the release
  version inserted into the tarball's cffi.asd.
- Update manual with git info.

- Keep it around for backwards compatibility.
- Don't use it from CFFI itself or the test suite.
- Update the manual.

Not sure if this is a great idea yet.  In any case, CFFI-FEATURES is
still there for backwards compatibility for the time being.

- Preliminary (likely buggy) version.  Includes documentation and tests.
- New cffi-features: big-endian and little-endian determined with CFFI
  code.
- Needs cleaning up.

- add asdf:test-op to the cffi system
- mark a couple more cmucl failures
- get rid of the warning in libtest.c about comparing void* and
  function pointer

- Makefile: new test-scl target. Add SCL's fasl file extensions
  to the clean target.
- Remove SCL TODO item.
- New file: cffi-scl.lisp.
- New primitive type :long-double. Since it's only supported by
  SCL, it's not worth adding a no-long-double feature just yet.
- New tests for :long-double.
- Add information about SCL and the new :long-double type to
  the user manual.

- Renamed :cffi/no-foreign-funcall and :cffi/no-long-long to
  cffi-features:foreign-funcall and cffi-features:long-long respectively
  (with the opposite meanings of course).
- Also new features (in the cffi-features package): darwin, unix, windows,
  ppc32 and x86. More could be added. The cffi-sys backends are
  responsible for pushing these features.

- Refactoring of the type translation mechanism, now based on
  generic functions. The only user-visible changes is that you can
  now specialize the on the argument of the translator, and there's
  no type argument now (which was useless too for user-defined types).
- Don't export define-type-spec-parser since it's useless on its own.
- The anonymous :enum type is gone.
- Updated manual.